Batch loop through folders copying contents

I'm a complete newb when it comes to batch programming and am struggling to do something that's probably very simple... I have a load of files in a set file structure and I want to copy out the contents of certain sub- folders into another folder. The file structure looks something like this: c:\myimages\producta\bigimages\ c:\myimages\producta\smallimages\ c:\myimages\productb\bigimages\ c:\myimages\productb\smallimages\ etc What I want to do is copy everything from: c:\myimages\*\bigimages\ to: c:\allthebigimages\ but as I can't seem to use wildcards in paths I figured I need to do a loop - at which point I get stuck. So how do I write a batch that loops through all the 'product' folders and copies everything from the 'bigimages' sub-folder? Thanks! John